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Teaching and learning of mathematics in junior one. One-dimensional linear inequality and practical problems.
Your inequality is wrong.

It should be: 350x-600-310 (x-1) > 310; ( 1)

x > from( 1)； 15

350 x-600-320(x- 1)& lt； 220(2)

X

So the number of people attending this meeting is 16.

Total cost of this conference: 350* 16-600=5000 yuan.

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